Grinding-machine.



E. O. PARTRIDGE.

GRINDING MACHINE.

APPLICATION IILED JAN. 17, 1913.

. 1 078 551 Patented Nov. 11, 1913.

COLUMBII PLANOORAPH io wAsl-lmo'romn. c.

E. 0. PARTRIDGE.

GRINDING MACHINE.

APPLICATION FILED JAN. 17, 1913.

1 078,551. Patented Nov. 11, 1913. 3 SHEETS-SHEET 2.

oeqv aw E. O. PARTRIDGE.

GRINDING MACHINE.

APPLICATION FILED JAN.17,1913.

1,078,551, Patented N0v.11,1913.

3 SHEETBSHEET 3.

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EDWARD O. PARTRIDGE, OF'GHICAGO, ILLINOIS GRINDING-MACHINE.

Specification of Letters Patent.

Application filed January 17, 1913. Serial No. 742,565.

make and use the same.

My invention relates to grinding machines and articularly to machinesemploying abrasive wheels made of emery or carborundum. Its objects areto provide a safety guard or hood which will be readily adjustable inposition to conform to variations in the diameter andthickness of thewheel, and in the spacing of the latter long1- tudinally of the shaftupon which it is mounted; in which the safety hood or shield may besecurely clamped in any desired position, and in which auxiliarysupports will add to the firmness and the safety afforded by theprotecting hood or shield. I accomplish these objects by theconstruction shown in the accompanying drawings, in which:

Figure -1 is a fragmentary side elevation of a grinder embodying myinvention. Fig. 2 is a fragmentary front elevation of the same. Fig. -3is a view similar to Fig. 1 but with the guard-hood adtary sectionthrough Fig. 1 along justed to protect a smaller wheel. Fig. .4 is anenlarged fragmentary rear view,

partly insection, of the grinder of Fig.

1'. Fig. -5-- is an enlarged fragmen the line 55, with the hood shiftedlaterally of its supports. Figs. 6 and 9- are 1 side elevations ofalternative embodiments of my invention. Fig. 7 is a vertical sectionthrough Fig. 6-- along the line elevation of a portion of the grindershown in Fig. -9. Fig. 11 is a fragmentary section through analternative form of hood and auxiliary support.

In the drawings, the abrasive wheel 1 is mounted upon a shaft 2, beinglaterally clamped between washers 3 and a collet 4 by a nut 5 engagingthe threaded end of the shaft. The shaft 2 is mounted on a bear- 111g 6forming part of a support, this support consisting preferably of acolumn 7 havin a Patented Nov.11,1913.

horizontal table 8 positionedbeneath tie wheel. The shaft 2 is reventedfrom movmg longitudinally of tie bearing 6 by the collet 4: and by thehub 9 of thedriving pulley 10, which latter is secured to the shaft atthe opposite side "of the bearing fromthe abrasive wheel.

The table 8 is provided at one edge with trunnions 11, to which links 12and 13 are pivotally connected by bolts 1 L and 15, these links beingpivotally connected attheir other ends by bolts 16 and 17 to aninflexible guard-hood 18 adapted to partly house the upper portion ofthe grinding wheel 1. The safety shield or hood 18 is preferably made oftwo symmetrical parts, formed of sheet steel,

each of the said parts having a flange por tion 19 adapted to depend atone side of the wheel, and a web portion 20 projecting outwardly of thehood proper. When the hood is thus made of two parts, the latter areseand each of which bolts is secured to the said table by nuts 31. Whenthe bolts 23, 24 and 25 are thus assembled, they constitute asubstantially vertical link formation which acts as a rigid auxiliarysupport or brace for the guard-hood. When the grind ing. wheel isdecreased in size, either by substituting one of smaller diameter orbythe gradual wear upon the periphery of the wheel, the hood may be keptin a proper guarding position by tilting it downwardly upon the links 12and 13, the vertical brace link being correspondingly. adjusted bymoving the nuts 26 upon the bolts 24 and Instead of having the rear ends27 and 28 of the hood supported by links laterally spaced to correspondto the. spacin between these links 12 and 13, I prefera lyspace theselinks farther apart than the outer edges of the said rear ends, therebyproviding room for washers 29 upon the bolt 16, as shown in Fig. 1-.Bytransferring some of these washers from one side to the other, as inFig. --5-, the hood may be moved laterally of its supports (orlongitutively shielding the' wheels. guard-hood or shield is thussupported by dinally of the shaft of the grinder), thereby permit-tin itto be centered over the wheel with whees of varying thicknesses, or withvarious thicknesses of washers 3 an'd'guard disks 30. To allow for sucha lateral motion .of the, hood, the perforations 26in the table 8 areelongated into slots extending parallel to the shaft 2.

While the guard of my 1nvention may be connected to the support by asingle link or pair of links, as in Figs. -6.. -8-, 9

lines in Fi 8- thereb ermittin of z: a Y P V a different. classes ofgrinding while still effec- VVhen the two pairs of links, as in Figs. -1and 3, the substantially vertical auxihary brace may toe-omitted ifdesired, although I still prefer to employ the same as giving the hoodincreased stabillty in case pieces of the abrasive wheel should bethrown centr1f :ugally against the hood by the breaking of the-wheel.

Instead of passing the horizontal portion 23 of the auxiliary linkthrough perforations 22 in the rib upon the hood, this rib may beprovided with. notched formations 36 adapted interchangeably to engagethe link portion 23, as in Figs. 9. and 11. The latter shows aconstruction in which the horizontal portion 23 of the auxiliary linkengages notches int-he cast rib 33 upon the hood while the portions 24and 25 have shoulder formations 34 adapted vertically to engage lateralflanges 35 upon the hood. Instead of making the hood of two ad- I joinedsheet metal parts, it may be made of a single integral casting 37,. asvin Figs. So also, the links supporting the hoodat its rear end may beunited into asingle cast link 38 and the latter may be pivotedtothesupport below the table, as in Figs. 9- and l0. In View of these and ofother modifications which may be made without departing from the spiritof my invention, I do not wish to be limitedto the details ofconstruction or arrangement as herein disclosed, but claim as'new:

1. Ina grinder, a shaft; an abrasive wheel mounted thereon; support forthe shaft; a guard-hood adapted to partially cover the wheel; andlinkmembers connecting the guard-hood with the said support, "one of thesaid link members being adjustable as to its point of engagement withthe guardhood, and also adjustable as to the distance 'between' itspoints of engagement with both the guard-hood and the said support.

2. Ina grinder, a shaft; an abrasive wheel mounted thereon; a supportfor the shaft; an inflexible guard-hood adapted to partially cover thewheel; and link members connecting the guard-hood with the said support,one of the said link members being "adustable as to its Joint of en aement with the guard-hood.

8. Ina grinder,'a shaft; an-abrasive wheel mounted thereon; aninflexible guard-hood adapted to partially cover thewhe'el, and a pairof substantially parallel links pivotally connecting one end of theguard-hood with the said support, the-saidlinks being" joined to theguard-hood at vertically separated points. f

l. In a grinder,'ashaft; an abrasive wheel mounted thereon; a supportfor the shaft;

periphery and sides of the wheel, and a plurality of links pivotallyconnecting one end of the guard-hood with the said support;

the said links being disposed substantially a guar l-hood adapted topartially'cover' the I vertically of each other, and being adjustablewith respect to the said support-transyersely of the'hood.

5. In a grinder, a shaft; an abrasive wheel mounted thereon; a supportfor the shaft;

a guard-hood adapted to partially house the periphery'and sides of thewheel; and a link supporting the guard-hood, the said link beingpivotally connected at its opposite ends to one end of theguard-hood'and to the support respectively; the guard-hood" beingadjustablewith' respect to the said link in direction parallel to thesaid shaft. 6. In a grinder, a shaft; an abrasive wheel mounted thereon;a support for the shaft;

a guardhood adapted to partially house the periphery and sides of thewheel; and a link pivotally connecting an end portion of theguard-hoodvwith the said support; both ends of the said guard-hood beingmovable transversely of the shaft; and a brace connecting l anotherportion ofthe guard-hood with the support, there being coactingformations upon the guard-hood for nterchangeably engaging the saidbrace.

7. In a grinder, a shaft; an abrasive wheel mounted thereon; asupport-for the shaft; an inflexible guard-hood pivotally mounted at oneof its ends upon the said support and adapted partially to-cover thesaid wheel, there being a stifl ening rib upon the said guard-hood; anda brace connecting the said guard-hood with the saidsupport, there beingcoact-ing formations upon the said stiffening rib for interchangeablyengaging the said brace;

8. In a grinder, a shaft; an abrasive wheel mounted thereon; a supportfor the shaft;

an inflexible guard-hood pivotally mounted at one of its ends upon thesaid support and adapted partially to cover the said Wheel, the saidguard-h0od comprisin a pair of laterally adjoined members havingcontacting Web portions extending outwardly of the hood; fastening meansfor securing the said Web portions to each other; and a brace connectingthe said laterally adj oined hood 10 members With the said support.

In testimony whereof I have signed my name in presence of twosubscribing wit- Copies of this patent may be obtained for five centseach, by addressing the Commissioner of Patents, Washington, D. G.

